Interest rates remained on hold once more today, marking nearly five years of the cost of borrowing being kept at the record low of 0.5%.

The Bank of England pledged last year not to consider a rise until the unemployment rate falls to 7% as part of efforts to support the UK's recovery.

Rates have stayed at the rock bottom level of 0.5% since March 2009, while the Bank has also pumped £375 billion into the economy under its quantitative easing programme to spur on growth.

But the strength of the economic revival in recent months has led to widespread speculation that the Bank will have to tweak its forward guidance to stave off a rate hike.

Economists predict that Bank governor Mark Carney will lower the unemployment target for considering a hike in the cost of borrowing as early as next month.

When he announced the new forward guidance policy on rates, the Bank predicted that unemployment would not fall to 7% until 2016.

But unemployment has been falling faster than expected - down to 7.4% in October - as the recovery gains traction, meaning the threshold could be hit far sooner.

Alan Clarke, of Scotiabank, said unemployment was "falling like a stone".

He added: "We think that 7% will be hit in the early months of 2014. As a result, the Bank is likely to modify its forward guidance policy - lowering the threshold to 6.5% - most likely at the February inflation report."

Brian Hilliard, at Societe Generale, said the threshold could "easily" be reduced below 6.5%.

Despite the Bank's assurances that rates will stay low for some time, the recent pace of recovery has fuelled fears that borrowing costs will have to rise soon.

Economists are forecasting that fourth-quarter 2013 gross domestic product growth at least matched the 0.8% recorded in the previous three months.

Closely-watched survey figures from the services, manufacturing and construction sectors have confirmed that despite a dip in activity last month, the economy enjoyed a strong end to 2014.

But the economy still has some way to go before recovering to pre-financial crisis levels.

Mr Hilliard said the Bank's Monetary Policy Committee (MPC) is not "anywhere near ready to raise rates, given the general state of the economy" and believes rates will remain on hold until the third quarter of 2015.

The recent strength of the pound is also thought likely to increase chances that rates will remain on hold, as it could weigh down on exports by making products more expensive for overseas buyers and damage efforts to rebalance the economy.

"Sterling's strength should help to contain consumer price inflation over the coming months and give inflation a good chance of staying close to its 2% target level for an extended period after dipping to a four-year low of 2.1% in November."

The British Chambers of Commerce (BCC) urged the Bank to resist the recent "clamour" for an early rates rise and remain committed to its 2% inflation target.

David Kern, chief economist at the BCC, said: "We believe that the MPC's forward guidance strategy continues to be beneficial for UK businesses."

He added: "It is important to avoid premature steps that could snuff out the recovery before it is on firmer ground."